Answer: the answer is unless.
Explanation:
I think it’s c introduction thesis
When Macbeth uses the bold phrase he suggests
that:
the news he's received makes him feel nervous
explanation: His uneasiness is very much evident in the way he deliver his words and the tone of his line has uneasiness in it
The banker had negative feelings towards the jurist. In the story, the jurist did him some not so good things. We would expect that the wager was done out of hatred for the jurist. The banker wanted to take revenge aginst the jurist.